fancy dress
masquerade
masquerade costume

This one had the fancy dresses and the little sports car.

From the late 80s or early 90s, fancy dress was introduced.

He'd brought home some fancy dress she was supposed to wear.

If you see a lot of fancy dresses, that is a good sign.

But early instruments are not there to provide fancy dress.

I just said that some of the guests were in fancy dress.

Most people had nearly finished, but there was no one in fancy dress.

In the crowd, though, fancy dress is the order of the day.

On the Saturday night there are usually 7000 people in fancy dress.

I didn't feel as if all my efforts with the fancy dress had been wasted though.